Update a link in the autograd_tutorial.py #5291

Job	Run time
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	20m 46s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	34m 41s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	25m 16s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 17s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	25m 44s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	33m 0s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	28m 15s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	39m 34s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	26m 38s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	31m 36s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	24m 54s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	28m 18s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	16m 7s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	27m 49s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	27m 18s
pytorch_tutorial_build_manager	21m 37s
	7h 7m 50s

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